It is the oldest mining pool, which has been in operation since 2010 and based in Czech Republic. The present CEO is Maret Palatinus. The company behind the pool is Satoshi Lab and the pool is known as Bitcoin Pooled Mining Server (BPMS) before.
It has servers in America, Asia,, Europe, USA, and Canada, because of this the users always enjoy smooth mining. It is very good for mining bitcoin and Zec. The minimum payout for btc is 0.001 and Zec is 0.001. It has 2Factors authentication and user can lock their address if they feel their account is been threatened.
What the users just need is to download the software which is Braiins OS and Braiins OS+. Slush pool has its own system of charging fees which is called scored-scored- based mining system which prevents the user from being cheated.
The pool has dedicated website to take care of their users, but if it is not urgent they can been reach through email. The pool share the transaction fee with miners.
So using slushpool is very simple and easy even for the first users.